Leer.



H. S. HEICHERT.

LEER. APPLICATION FILED DEC.2B, 1915- LQJYQD Patented July 10, 1917.

4 SHEETS,SHEET l. W

WITNESSES ib/M ATTORNEYS H. S. HEICHERT.

LEER. APPLiCATlON FILED DEC-28. 1915.

Patented July 10, 191?.

4 SHEETS-SHEET 2.

WITNESSES ATTORNEYS H. S. HEICHERT.

LEER.

APPLICATION FILED DEC.28, 1 915. L 3 fi9fiu Patented July 10, 1917.

4 SHEETS-SHEET 3- WITN ESSZ INVENTOW.

X Aw W MTTORNEVQ.

H. S. HEICHERT.

LEER.

APPLICATION FILED DEC.28, x915.

Patented July 10, 1917.

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4 SHEETS-SHEET 4.

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ATTORNEVS.

HERMAN S. HEICHERT, 0F PITTSBURGH,

PENNSYLVANIA, ASSIGNOR T0 PITTSBURG PLATE GLASS COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPQRATION OF PENNSYLVANIA.

tain new and useful Improvements in Leers.

of which the following is a specification.

The invention relates to leersfor use in the manufacture of glass and has for its object; the provision of improved'means whereby the temperature of the leer may be regulated throughout its length to suit requirements and to meet varying conditions. Certain embodiments oi the invention are illustrated in the accompanying drawings wherein- Figure 1 is a diagrammatic plan view showing the application of one of the simplest forms of the invention to an ordinary plate glass leer. Fig. '2 is an end view of one of the radiating drums shown in detail in Figs. 3 and -l-. Fig. 3 is a plan view of one of the drums. Fig. l is a transverse section through the leer and longitudinally of one of the radiating drums. Figs. 5 and 6 are trans verse sections through modified structures. Fig. 7 is a diagrammatic view of another modification. Fig. 8 is a transverse section through the preferred type'of construction. and Figs; 9 and 10 are transverse sections through still other modified forms.

Due to varying conditions leers often become too hot or too cold at certain portions throughout their length. This condition may be due to changes in atmospheric temperature or to wind conditions and interferes with the proper operation of the leer. It is the purpose of my invention to provide means for ovcrcoming'this difficulty and giving a regulation throughout the length of the leer which may be adjusted to suit varying conditions.

Briefly stated, my invention consists in the provision of radiating or cooling chambers or receptacles arranged at intervals along the length of the leer and min mum,- eating with the leer. with the provision of doors or' any governing the openings between the leer and the chambers. In some cases, and preferably. the air in the chambers or receptacles which case the chambers are constructed of sheet metal, which is corrugated to give a large radiating capacity and are closed so that a too rapid desired regulating means for LEER.

Specification of Letters Patent. Patfemtmd J 1W 1(1) 9 1mm? 0 Application filed December 28, 1915. Serial No. 68 997.

' a. cooling 1s avoided when the chambers are brought into commumcation with the leer.

In other cases the cooling ellect is secured primarily by the use of heat absorbing means arranged in or around the chambers or receptacles. In some cases circulation from the leer to the receptacles and back again may be secured by a fan or other means for producing a flow of air, while in other casesartificial circulating means are dispensed with. hen the radiating chambers are employed. means are preferably provided for varying their radiating capacity and for returning the cooled air at a point relatively close'to the surface of the glass in the leer. By means of these constructions. it the leer becomes too hot at any point. it can be cooled by means of the receptacles and the excess heat dissipated. and such cooling can be regulated to a nicety.

Referring first to Figs. 1 to l. which illus .trate one of the simplest forms of the invention. the entrance portion of the leer is indicated by th" numeral 1. while 2 is the main portion of the leer which is of considerable length and to which the tempera ture regulating means is applied. it being understood that the invention is applicable to leers of all kinds. Arranged at intervals along the length of the portion '2 are the radiating drums 3, shown in detail in Figs. 2. 3 and 4.

The drums 3 are preferably constructed of corrugated sheet metal which gives them a maximum radiating capacity and may be applied across the crown 4: of the] leer as shown in Fig. 4. Openings 5 provide a means of communication from the leer to the drums and these openings are governed by means of the doors or covers 6 which maybe raised by means of the cables 7 extending over the pulleys 8 and down to the bar 9. upon which the cables are wound..such bar being rotated by any desired means. The'drurns are provided with end walls 10 and are preferably entirely closed ofi from communication with the atmosphere in order to prevent drafts such as would cause too rapid cooling when the covers 6 are raised.

When the covers are raised a circulation of air is secured. the hottefi air in the leer passing up through the central openings at the top of the crown. and the relatively cooler air in the drum descending into the leer through the side openings. By using a.

' An operating rod top.35 of the chamber and is moved, up and sleeve extending down into the leer from the opening and corresponding to the members 39 and 51, later described in connection with Figs. 8 and 9, the circulation may be reversed with the results as set forth later with respect to the constructions of Figs. 8 and 9. This arrangement and spacing of the drums may be changed to meet varying conditions and all or only a part of the drums mav be used at any one time. The amount of heat which passes to each drum may also be regulated by the height to which the covers are raised. 'This' type. of apparatus regulates the quantity of air circulated but not the radiating capacity of the chambeis as is the case with the preferred form of construction later described.

In the modification of Fig. 5 the receptacle 12 over the leer 13 is a cooling chamher, but the cooling is secured by means of the cooling pipes 14 rather than by radiation from the walls of the chamber. Any desired medium, such as water or air. may be caused to circulate through the pipes 14, and the openings 15 are governed by covers or doors 16 as in the other. type of construction. The heat absorbing capacity of the chamber may be regulated by varying the rapidity of circulating the cooling medium in the pipes 14. a

In the construction of Fig. 6 the chamber 17 is cooled by means of a coil 18 through which air or water is circulated. butthe chamber is located difi'erently than in the construction of Fig. 5, and a circulation of air is secured by means of the fan 19, air being drawn from the bottom of the leer :20 through the passages 22 and E23 and returned through the pipe 21. The flow is controlled by regulating the speed of the fan and by means of a damper 24.

Fig. 7 indicates diagrammatically still another modification wherein the cooling chamber or receptacle is in the form of a coil 25 through which air is drawn from the passages 28 and '29 at the bottom of the leer 26 by means of the fan 27 and returned to the top of thc leer through the pipe leading from the coil.

Fig. 8 illustrates a transverse section through the preferred type of apparatus. 30 in this construction. being the crown of the leer, 31a glass sheet which is moving longitudinally ofthe leer, and 32 a radiating chamber, preferably of corrugated sheet metal mounted upon the top of the leer and provided with a plunger 33 for regulating the heat radiating capacity of the chamber. 34 extends through the down by the cable. 36 passing around the sheaves shown to the winding drum 37.

The heated air is withdrawn from the crown of the furnace through the passage 38 and returned through the passage 39,

r so .that

such pamage having a lower telescopic end the level at which the cooled air "is returned'to the leer may be varied to suit conditions. The position of the tele- 'SCOPlc end 40 is regulated by means of the cable 41 passing over the sheaves shown, and operated from the winding drum 42. A pair of dampers 43 and 44 are located in the passages 38 and 39.

he foregoing arrangement is advantageous in thatit permits the heat radiating capacity of the drum 'to be regulated to a close degree, the plunger or diaphragm 33 being raised and lowered. as it is desired to increase or decrease the cooling capacity of the chamber. The dampers 43 and 44 serve to limit the amount of air circulation, so that the construction provides for a double regulation. The depending telescopic end 40 permits the air to be supplied at a point adjacent the glass where its cooling effect is greatest and permits of the regulation of this point to meet conditions. The cool air is also appliednearthe center of the sheet where the cooling action is most needed because of the fact that the edges of the glass radiate their heat more rapidly than the central portion. The advantages of this preferred type of construction will be readily apparent to those skilled in the art.

Fig. 9 iliustrates a construction in which the capacity of the radiating chamber 45 is varied by means ot'v an oscillating diaphragm 46 operated from a cable 47 extending to awinding drum 48, the chamber being approximately triangular in cross-see tion as illustrated. Air iswithdrawn from the leer 49 through the passage and returned through the passage 51- extending down into the leer to a point adjacent the glass 52.

Fig. 10 illustrates a construction wherein the radiating capacity of the chamber-53 is regulated by means of a telescopic insulating cover 54 which can be moved up and down by means not shown. This cover may consist of parallel shells of metal with an insulating material 55 therebetween. IThe air is withdrawn from the leer 56 through the passage 57 and returned through the passage 58. The lowering of the insulating cover reduces the radiating capacity of the chamber.

\Vhat- I claim is:

1. The combination with a leer. of heat radiating means arranged at intervals along the leer and opening into the leer.'and means for regulating the openings.

:2. The combination with a leer, of heat radiating'chambers arranged at intervals along the leer and opening into the leer,

the heat radiating and means the leer and opening into the leer, means for regulating the Openings, and means for regulating the heat radiating capacity of the radiating means.

4:. The combination with a leer, of temperature regulating means therefor comprising cooling receptacles arranged along the length of the leer and means for securing a circulation of air from the leer to the receptacles and back to the leer.

The combination with a leer, of temperature regulating means therefor comprising cooling receptacles arranged along the length of the leer, and means for securing a circulation of air between the leer and receptacles and for governingsuch circulation.

6. The combination with aleer, of temperature regulating means therefor comprising closed cooling receptacles arranged along the length of the leer, and means whereby'a circulation of air from the leer to the chambers and back again is secured.

T. The combination with a leer, of temperature regulating means therefor comprising cooling receptacles arranged-along the length of the leer, and having openings communicating with the leer, and means for governing the openings.

8. The combination with a leer, of temperature regulating means therefor comprising closed cooling'receptacles arranged at intervals along the length of the leer and having openings communicating with the leer,

for governing the openings.

9. The combination with a leer, of temperature regulating means therefor comprising metal radiating chambers arranged along the length of the leer and having openings communlcating therewith and means for governing the openings.

10. The combination with a leer, of temperature regulating means therefor comprisarranged along the length of the leer and opening thereinto, and meansfor governing the openings.

11. The combination with a leer, of tem perature regulating means thereforcomprising closed metal radiating chambers arranged along the length of the leer and having openings communicating therewith and means for governing the openings.

12. The combination with a leer, of temperature regulating means therefor comprising cooling. receptacles arranged along the length ofthe leer, and meahs for securing with, and means for varying the a circulation of air between the leer and receptacles comprising passages for withdrawing air from the upper portion. of the leer and returning it to the lower portion thereof.

13. The combination with a leer, of temperature regulating means therefor comprising cooling receptacles arranged along the length of the leer. andmeans for securing a circulation of air between the leer and receptacles comprising passages for withdrawing air from the leer and passages leading down to a level adjacent the upper surface of the glass in the leer.

11. The combination with a leer, of temperature-regulating means therefor comprising cooling receptacles arranged along the length of and'above the leer, and means for securing a circulation of air between the leer and receptacles comprising passages for withdrawing air from the upper portion of the leer and passages leading from the chambers down to a level adjacent the upper surface of the glass in the leer.

15. The combination with a leer, of temperature regulating means therefor compr1s-' ing cooling receptacles arranged along the length of and above the leer, and means for securing a circulation of air between the leer and receptacles comprising passages for withdrawing air from the leer and passages leading from the chambers down to a level adjacent the upper surface of the glass in the leer, the lower ends of such passages being adjustable vertically. v

16. The combination with a leer, of temperature regulating means therefor comprising cooling receptacles arranged along the length of the leer, and means for securing a circulation of air between the leer and receptacles comprising passages for Withdrawlng air from the upper portion of the leer and returning it to the lower portion thereof and against the upper surface of the glass in the leer.

17. The combination with a leer, of temperature regulating means therefor comprising radiating chambers arranged along the length of the leer and communicating thereradiating capacity of the chambers comprising dividing members mounted for movement in the chambers and adapted to vary the volumes of the portions of the chambers in communication with the leer.

H. s. HEICHERT.

the upper portion of 

